Streamlined subglacial bedforms across isolated topographic highs in the Puget Lowland, Washington state

• Main Authors: McKenzie, Marion A, Simkins, Lauren M, Slawson, Jacob S, Wang, Shujie
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: bedforms; Geomorphology; GIS file; glacial history; Ice Sheet; Office Open XML Workbook; subglacial; topography; The Cryosphere
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.954529; https://doi.org/10.1594/PANGAEA.954529

These data include shapefiles of streamlined subglacial bedforms, elongate bedforms created at the glacier-bed interface by erosional and depositional processes, characterized by polygons across nine isolated bedrock highs in the deglaciated Puget Lowland of Washington state. These data are based on digital elevation models (DEMs) published by Clallam County, Washington Department of Natural Resources, WA, 2008, Quantum Spatial Inc., 2017, 2019; OCM Partners, 2019a, 2019b. Streamlined subglacial bedforms polygons were identified using two semi-automated tools utilizing Topographic Position Index (TPI) methodology (McKenzie et al., 2022) and contour tree-mapping (Wang et al., 2017) used to calculate slope and elevation variations across any Digital Elevation Model, respectively. Shapefile attribute tables and excel file include streamlined bedform morphologies for all 3,273 bedforms categorized into upstream, on top of, or downstream of the topographic bump based on the direction of ice flow. The morphometric information for all bedforms includes features area, width, length, orientation, elevation and slope ranges, and elongation. The morphological characteristics of these streamlined subglacial bedforms provide information on ice-streaming characteristics and changes across topographic highs in the subglacial environment.